Resistor circuit
First Claim
1. A resistor circuit comprising:
- a reference MOS resistor;
a variable MOS resistor;
first control means for controlling a gate voltage of the reference MOS resistor such that a resistance of the reference MOS resistor is controlled to be constant;
voltage detection means for detecting half of a drain-source voltage of the reference MOS resistor; and
second control means for controlling the variable resistor by supplying a gate voltage of the variable MOS resistor on the basis of the gate voltage of the reference MOS resistor controlled by the first control means and half the drain-source voltage of the reference MOS resistor detected by the voltage detection means.
1 Assignment
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Accused Products
Abstract
Operations as a variable resistor are favorably realized even when a drain-source voltage of a variable MOS resistor and that of a reference MOS resistor are not the same. A gate voltage of the variable MOS resistor is controlled with reference to a gate voltage which is controlled such that a voltage generated in the reference MOS resistor is controlled to be the same as a reference voltage. A resistor is connected in parallel with the reference MOS resistor between the drain and source thereof, the resistor including a pair of resistors having the same resistance connected in series. Half of a drain-source voltage of the reference MOS resistor is detected at an intermediate point of the pair of resistors. The gate voltage of the variable resistor is obtained by subtracting one-half of the drain-source voltage from the gate voltage of the reference MOS resistor.
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Citations
9 Claims
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1. A resistor circuit comprising:
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a reference MOS resistor; a variable MOS resistor; first control means for controlling a gate voltage of the reference MOS resistor such that a resistance of the reference MOS resistor is controlled to be constant; voltage detection means for detecting half of a drain-source voltage of the reference MOS resistor; and second control means for controlling the variable resistor by supplying a gate voltage of the variable MOS resistor on the basis of the gate voltage of the reference MOS resistor controlled by the first control means and half the drain-source voltage of the reference MOS resistor detected by the voltage detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification